Banner announcing upcoming website changeover (#382)

* test 2 for website switch banner

put banner above 'Welcome to ReproNim' on the index page

the banner is at h2 header size font (second largest)

the 'Welcome..' is changed to h3 header size (third largest)

* Update index.html - formatting

small tweak punctuation

Author: juliebates

index.html

@@ -67,7 +67,8 @@ <h1 class="promo-text">ReproNim: A Center for Reproducible Neuroimaging Computat
 
             <section class="section-2">
                 <div class="container">
-                    <h2 class="section-heading text-center">Welcome to ReproNim!</h2>
+                    <h2 class="section-heading text-center">Coming soon! ReproNim's new website is scheduled to be here by the end of July. All content on our old site will subsequently be available at legacy.repronim.org</h2>
+			<h3>Welcome to ReproNim!</h3>
 			<p> 
 				ReproNim's goal is to improve the reproducibility of neuroimaging science and extend the value of our national investment in neuroimaging research, while making the process easier and more efficient for investigators.
 			</p>
@@ -216,7 +217,7 @@ <h3>Breaking News</h3>
 			</ul>
 	</ul>
 
-	<li>Announcing <a href="https://www.reprorehab.usc.edu/">ReproRehab - 2025-2026</a>! Reproducible Rehabilitation (ReproRehab) research education program</li>
+	<li>Announcing <a href="https://www.reprorehab.usc.edu/">ReproRehab - 2025-2026!</a> Reproducible Rehabilitation (ReproRehab) research education program</li>
 		<ul>